From "The Five People You Meet In Heaven":
"Parents do not let their children go. Children leave their parents. Instead of looking to their parents for approval, they look at their own accomplishments as their gauge."
"The water was below the roots of their love."
"All parents damage their children."
"Holding anger is a poison...It eats you from inside...We think that by hating someone we hurt them...But hatred is a curved blade...and the harm we do to others...we also do to ourselves."
"Strangers are family you have yet to come to know."
"Sometimes when you sacrifice something precious, you're not really losing it. You're just passing it on.....
"Young men go to war. Sometimes because they have to, sometimes because they want to. Always, they feel they are supposed to........courage confused with picking up arms, and cowardice confused with laying them down."
Here are a couple I remember from "Stones Into Schools:
"A village called New York was just bombed." (spoken by someone in Afganistan)
"Style is everything". (referring to learning to communicate with those unlike you)
Lots more good ones escape me. What do you remember?